# Copyright (c) 2025 PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
Environment variables used by FastDeploy.
"""

import os
from typing import Any, Callable

environment_variables: dict[str, Callable[[], Any]] = {
    # Whether to use BF16 on CPU.
    "FD_CPU_USE_BF16": lambda: os.getenv("FD_CPU_USE_BF16", "False"),
    # Cuda architecture to build FastDeploy.This is a list of strings
    # such as [80,90].
    "FD_BUILDING_ARCS": lambda: os.getenv("FD_BUILDING_ARCS", "[]"),
    # Log directory.
    "FD_LOG_DIR": lambda: os.getenv("FD_LOG_DIR", "log"),
    # Whether to use debug mode, can set 0 or 1
    "FD_DEBUG": lambda: os.getenv("FD_DEBUG", "0"),
    # Number of days to keep fastdeploy logs.
    "FD_LOG_BACKUP_COUNT": lambda: os.getenv("FD_LOG_BACKUP_COUNT", "7"),
    # Model download source, can set "AISTUDIO", "MODELSCOPE" or "HUGGINGFACE".
    "FD_MODEL_SOURCE": lambda: os.getenv("FD_MODEL_SOURCE", "AISTUDIO"),
    # Model download cache directory.
    "FD_MODEL_CACHE": lambda: os.getenv("FD_MODEL_CACHE", None),
    # Maximum number of stop sequences.
    "FD_MAX_STOP_SEQS_NUM": lambda: os.getenv("FD_MAX_STOP_SEQS_NUM", "5"),
    # Maximum length of stop sequences.
    "FD_STOP_SEQS_MAX_LEN": lambda: os.getenv("FD_STOP_SEQS_MAX_LEN", "8"),
    # GPU devices that will be used. This is a string that
    # splited by comma, such as 0,1,2.
    "CUDA_VISIBLE_DEVICES": lambda: os.getenv("CUDA_VISIBLE_DEVICES", None),
    # Whether to use HuggingFace tokenizer.
    "FD_USE_HF_TOKENIZER": lambda: bool(int(os.getenv("FD_USE_HF_TOKENIZER", "0"))),
    # Set the high watermark (HWM) for receiving data during ZMQ initialization
    "FD_ZMQ_SNDHWM": lambda: os.getenv("FD_ZMQ_SNDHWM", 10000),
    # cache kv quant params directory
    "FD_CACHE_PARAMS": lambda: os.getenv("FD_CACHE_PARAMS", "none"),
    # Set attention backend. "NATIVE_ATTN", "APPEND_ATTN"
    # and "MLA_ATTN" can be set currently.
    "FD_ATTENTION_BACKEND": lambda: os.getenv("FD_ATTENTION_BACKEND", "APPEND_ATTN"),
    # Set sampling class. "base", "base_non_truncated", "air" and "rejection" can be set currently.
    "FD_SAMPLING_CLASS": lambda: os.getenv("FD_SAMPLING_CLASS", "base"),
    # Set moe backend."cutlass","marlin" and "triton" can be set currently.
    "FD_MOE_BACKEND": lambda: os.getenv("FD_MOE_BACKEND", "cutlass"),
    # Set whether to disable recompute the request when the KV cache is full.
    "FD_DISABLED_RECOVER": lambda: os.getenv("FD_DISABLED_RECOVER", "0"),
    # Set triton kernel JIT compilation directory.
    "FD_TRITON_KERNEL_CACHE_DIR": lambda: os.getenv("FD_TRITON_KERNEL_CACHE_DIR", None),
    # Whether transition from standalone PD decoupling to centralized inference
    "FD_PD_CHANGEABLE": lambda: os.getenv("FD_PD_CHANGEABLE", "0"),
    # Whether to use fastsafetensor load weight (0 or 1)
    "FD_USE_FASTSAFETENSOR": lambda: bool(int(os.getenv("FD_USE_FASTSAFETENSOR", "0"))),
    # Whether to use DeepGemm for FP8 blockwise MoE.
    "FD_USE_DEEP_GEMM": lambda: bool(int(os.getenv("FD_USE_DEEP_GEMM", "1"))),
    # Whether to use aggregate send.
    "FD_USE_AGGREGATE_SEND": lambda: bool(int(os.getenv("FD_USE_AGGREGATE_SEND", "0"))),
    # Whether to open Trace.
    "TRACES_ENABLE": lambda: os.getenv("TRACES_ENABLE", "false"),
    # set traec Server name.
    "FD_SERVICE_NAME": lambda: os.getenv("FD_SERVICE_NAME", "FastDeploy"),
    # set traec host name.
    "FD_HOST_NAME": lambda: os.getenv("FD_HOST_NAME", "localhost"),
    # set traec exporter.
    "TRACES_EXPORTER": lambda: os.getenv("TRACES_EXPORTER", "console"),
    # set traec exporter_otlp_endpoint.
    "EXPORTER_OTLP_ENDPOINT": lambda: os.getenv("EXPORTER_OTLP_ENDPOINT"),
    # set traec exporter_otlp_headers.
    "EXPORTER_OTLP_HEADERS": lambda: os.getenv("EXPORTER_OTLP_HEADERS"),
    # enable kv cache block scheduler v1 (no need for kv_cache_ratio)
    "ENABLE_V1_KVCACHE_SCHEDULER": lambda: int(os.getenv("ENABLE_V1_KVCACHE_SCHEDULER", "0")),
    # Whether to use PLUGINS.
    "FD_PLUGINS": lambda: None if "FD_PLUGINS" not in os.environ else os.environ["FD_PLUGINS"].split(","),
    # set trace attribute job_id.
    "FD_JOB_ID": lambda: os.getenv("FD_JOB_ID"),
    # support max connections
    "FD_SUPPORT_MAX_CONNECTIONS": lambda: 768,
}


def __getattr__(name: str):
    # lazy evaluation of environment variables
    if name in environment_variables:
        return environment_variables[name]()
    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")


def __dir__():
    return list(environment_variables.keys())
